Rohrbach BW, Patton S. Effects of Diagnostic Test Accuracy and Treatment Efficacy on the Occurrence of Suspected Failure of Heartworm Prophylaxis in Dogs. J Vet Intern Med 2013; 27: 791–797.

Article first published online: 10 MAY 2013 | DOI: 10.1111/jvim.12092

The population statistics in this article need to be updated. The conclusions are not affected.

The revised sentences are printed below.

On page 792, in the first paragraph of the Results section:

The first sentence should be “The 2010 census reported there are 46.3 million dog owning households with an average of 1.69 dogs per household for a total of 78,247,000 dogs.”

The second sentence should be “An estimated 90% of dog-owning households reported veterinarian visits during 2010.”

The third sentence should be “Assuming 1 visit per dog, approximately 70,422,300 dogs were presented to veterinary hospitals of which 58% received heartworm preventive medication for a total of 40,844,934.”

On page 794, in the second paragraph:

The second sentence should be “An estimated 70,422,300 dogs were presented to veterinarians during the year.”

On page 795, in the first paragraph:

The first sentence (continued from page 794) should be “Assuming a stable population with an average life expectancy of 13 years, the estimated number of new puppies born to this population each year would be 5,417,100.”

The second sentence should be “If 58% (3,141,918) were placed on heartworm preventive at 8 weeks of age, and not given an initial heartworm test until approximately 1 year later, an estimated 83,983 of these dogs that were free of heartworm infection would test positive at the first test.”

On page 795, in the third paragraph:

The first sentence should be “Based on the APPA data, we estimate that 70,422,300 dogs in the United States are presented to a veterinarian at least once annually of which 58% (40,844,934) are placed on heartworm prophylaxis.”

The second sentence should be “Conservatively estimating that 50% (20,422,467) of these dogs will be tested annually and by substituting an average prevalence of adult heartworm infection of 1% among the population of dogs in the United States, the positive predictive value of the heartworm test would be 22.6% and the negative predictive value 99.8%.”

The third sentence should be “This would result in a total of 545,893 dogs negative for adult heartworm that would have positive heartworm test results.”

The fourth sentence should be “If we substitute a sensitivity of 70.7% and a specificity of 96.7% for antigen tests that are currently available and evaluated since 2000, the estimated number of dogs free of adult heartworms that would have a positive antigen test result would increase to 667,202.”